ENH: smoke test (and somewhat a benchmark -- import mvpa2.suite while injecting
ENH: smoke test (and somewhat a benchmark -- import mvpa2.suite while injecting

atm 2.20s vs 25.0s!

$> time venv-mvpa2-stock/bin/python -c 'import mvpa2.suite as mv'
venv-mvpa2-stock/bin/python -c 'import mvpa2.suite as mv'  2.20s user 0.29s system 97% cpu 2.556 total

vs

$> time DUECREDIT_ENABLE=1 venv-mvpa2-stock/bin/python -c 'import duecredit; import mvpa2.suite as mv'
DueCredit Report:

0 modules cited
0 functions cited

DUECREDIT_ENABLE=1 venv-mvpa2-stock/bin/python -c   24.97s user 0.65s system 98% cpu 26.070 total

Simply decorating __import__ with doing nothing extra

DUECREDIT_ENABLE=1 venv-mvpa2-stock/bin/python -c   6.43s user 0.50s system 98% cpu 7.068 total

so there is a noteable hit by that alone, but majority comes from our code, so
needs to be optimized more etc.

mvdoc/duecredit,jgors/duecredit,lesteve/duecredit